Effect of Laser Shock Processing (LSP) on the Fatigue Resistance of an Aluminum Alloy

1999 ◽  
Vol 122 (1) ◽  
pp. 104-107 ◽  
Author(s):  
Tang Yaxin ◽  
Zhang Yongkang ◽  
Zhang Hong ◽  
Yu Chengye
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Polyvinylidene Fluoride ◽  
Surface Hardness ◽  
Resistance Mechanisms ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Fatigue And Fracture ◽  
Before And After ◽  
Shock Processing

The laser shock induced stress wave is described and measured with a polyvinylidene fluoride (PVDF) transducer. A principle for selecting laser parameters is proposed. A small sized laser with a high power is used for Laser Shock Processing (LSP). The fatigue life of the aluminum alloy 2024T62 is greatly improved after LSP. With 95% confidence, the mean fatigue life of LSP specimens is 4.5–9.8 times that of unshocked ones. The fatigue and fracture resistance mechanisms of LSP such as the variation of the surface hardness, the microstructure and the fracture section of specimens before and after LSP are analyzed. [S0094-4289(00)01601-7]

Experiment of Laser Shock Processing on AISI 8620 Alloy Steel

2011 ◽  
Vol 464 ◽  
pp. 478-481
Author(s):  
R.H. Shen ◽  
J.Z. Lu ◽  
J.W. Zhong ◽  
L. Zhang ◽  
Kai Yu Luo ◽  
...  
Keyword(s):  
Residual Stress ◽  
Surface Hardness ◽  
Base Material ◽  
High Amplitude ◽  
High Energy ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Before And After ◽  
Shock Peening ◽  
Shock Processing

Laser shock processing (LSP, also known as Laser shock peening) is applied by using a high energy pulsed laser to create a high amplitude stress wave or shock wave on the surface to be treated. LSP is proved to be superior to conventional treatments such as shot peening in many engineering products. This paper focuses on Laser shock processing and its effects on mechanical properties of material AISI 8620 alloys steel. Experiment results indicated that compared with base material, the surface hardness increased by 13.8%, and compressive residual stress increased by 521%. Statistical method was introduced to analyze hardness and residual stress change before and after the LSP.

Numerical Simulation of Fatigue Life of 7050 Aluminum Alloy Processed by Laser Shock Processing

2010 ◽  
Vol 37 (12) ◽  
pp. 3192-3195 ◽  
Author(s):  
张洁 Zhang Jie ◽  
顾祥 Gu Xiang ◽  
祝乐 Zhu Le ◽  
孙爱华 Sun Aihua
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Fatigue Life ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
7050 Aluminum Alloy ◽  
Shock Processing

The Microstructure and Properties of LY12 Aluminum Alloy by Ultra-High Plastic Strain

2011 ◽  
Vol 464 ◽  
pp. 708-711
Author(s):  
Ling Feng Zhang ◽  
Kai Yu Luo ◽  
J.Z. Lu ◽  
Y. Xiong ◽  
Y.Z. Wang
Keyword(s):  
Electron Microscopy ◽  
Aluminum Alloy ◽  
Plastic Strain ◽  
Surface Hardness ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Plastic Deformation Behavior ◽  
High Plastic Strain ◽  
Shock Processing ◽  
High Plastic

The ultra-high plastic deformation behavior by laser shock processing on the LY12 aluminum alloy had been investigated. The morphology of the materials had been analyzed by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). It was found that the grain refinement layer was formed in the thickness of about 100μm .The dislocation density of LY12 aluminum alloy should be large increased after laser shocking because the accumulation of dislocation was appeared on the grain boundary. With the laser energy density increased there formed subgrain structure and eventually generate ultra-fine grain. Hardness test results also show that the surface hardness obtains a big growth about 60% after laser shock processing. The results showed that the formation of ultra-high plastic strain can improve the surface hardness of LY12 aluminum alloy, and thus effectively improve the comprehensive mechanical properties.

Fatigue Crack Propagation Experiment and Simulation on 7050 Aluminum Alloy

2011 ◽  
Vol 464 ◽  
pp. 560-563
Author(s):  
Xu Dong Ren ◽  
Yong Zhuo Huangfu ◽  
Yong Kang Zhang ◽  
Da Wei Jiang ◽  
Tian Zhang
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Crack Growth ◽  
Crack Propagation ◽  
Crack Growth ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
7050 Aluminum Alloy ◽  
Shock Processing

In this paper, an experiment of fatigue crack propagation in 7050 aluminum alloy was presented. Laser shock processing (LSP) is used to shock the crack surface. Compared with the specimen without LSP, the fatigue life after LSP increased greatly. The simulation of the fatigue crack growth in 7050 aluminum alloy is implemented in FRANC2D. Simulating result is in accordance with the result of the experiment well. Laser shock processing increases the fatigue life and reduce fatigue crack growth rate, it has good prospect on the study of crack arrestment.

Effects of laser shock processing on the fatigue life of 2024-T62 aluminum alloy

1996 ◽  
Author(s):  
Hongtao Zhang ◽  
Boliang Lu ◽  
Shuren Zhang ◽  
Yaxin Tang ◽  
Chengye Yu
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing

Effects of Sheet Thickness on Residual Stress Distribution by Laser Shock Processing of 7050-T7451 Aluminum Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 3778-3781
Author(s):  
Yin Fang Jiang ◽  
Lei Fang ◽  
Zhi Fei Li ◽  
Zhen Zhou Tang
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Sheet Thickness ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Element Analysis ◽  
Finite Element Software ◽  
Shock Processing

Laser shock processing is a technique similar to shot peening that imparts compressive residual stresses in materials for improved fatigue resistance. Finite element analysis techniques have been applied to predict the residual stresses from Laser shock processing. The purpose of this paper is to investigate of the different sheet thickness interactions on the stress distribution during the laser shock processing of 7050-T7451 aluminum alloy by using the finite element software. The results indicate that the sheet thickness has little effects on the compression stress in the depth of sheet, but great impacts on the reserve side.

Micro-Structural Enhancement Mechanism of LY2 Aluminum Alloy by Means of a Single Laser Shock Processing

2010 ◽  
Vol 37 (10) ◽  
pp. 2662-2666 ◽  
Author(s):  
鲁金忠 Lu Jinzhong ◽  
罗开玉 Luo Kaiyu ◽  
冯爱新 Feng Aixin ◽  
钟俊伟 Zhong Junwei ◽  
孙桂芳 Sun Guifang ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Enhancement Mechanism ◽  
Single Laser ◽  
Shock Processing
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